there is water enough for the feed of a non condensing engine, there
is enough to condense, and to produce a good vacuum.

The evaporative condenser simply consists of a series of pipes, in
which is the steam to be condensed, and over which the water is
allowed to fall in a continuous rain. By this arrangement there is
evaporated from the outside of the condenser a weight of water which
goes away in a cloud of vapor, and is nearly equal to that which is
condensed, and is returned as feed into the boiler. The same water is
pumped up and used outside the condenser, over and over, needing no
more to supply the waste than would be needed as feed water. Although
this condenser has, as I have said, been in use for thirty or forty
years, one still sees engines working without condensation at all, or
with waterworks water, purchased at a great cost, and to the detriment
of other consumers who want it for ordinary domestic purposes; or one
sees large condensing ponds made, in which the injection water is
stored to be used over and over again, and frequently (especially
toward the end of the week) in so tepid a state as to be unfit for its
purpose. The governing is now done by means of quick-running
governors, which have power enough in them to raise not merely the
weight of the pendulum ball, which is now small, but a very heavy
weight, and in this way the governing is extremely effective. I
propose to say no more, looking at the magnitude of the whole of my
subject, upon the engine used for manufacturing purposes, but rather
to turn at once to those employed for other objects.


STEAM NAVIGATION.

In 1831, there were a considerable number of paddle steamers running